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uniform vec4 color;
in vec2 radii;
out vec4 fragColor;
void main()
{
float dist = length(gl_PointCoord - vec2(0.5));
/* transparent outside of point
* --- 0 ---
* smooth transition
* --- 1 ---
* pure point color
* ...
* dist = 0 at center of point */
fragColor.rgb = color.rgb;
fragColor.a = mix(color.a, 0.0, smoothstep(radii[1], radii[0], dist));
if (fragColor.a == 0.0) {
discard;
}
}
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